Add parallel search mode and index progress bar

Features:
- CCW smart_search: Add 'parallel' mode that runs hybrid + exact + ripgrep
  simultaneously with RRF (Reciprocal Rank Fusion) for result merging
- Dashboard: Add real-time progress bar for CodexLens index initialization
- MCP: Return progress metadata in init action response
- Codex-lens: Auto-detect optimal worker count for parallel indexing

Changes:
- smart-search.ts: Add parallel mode, RRF fusion, progress tracking
- codex-lens.ts: Add onProgress callback support, progress parsing
- codexlens-routes.ts: Broadcast index progress via WebSocket
- codexlens-manager.js: New index progress modal with real-time updates
- notifications.js: Add WebSocket event handler registration system
- i18n.js: Add English/Chinese translations for progress UI
- index_tree.py: Workers parameter now auto-detects CPU count (max 16)
- commands.py: CLI --workers parameter supports auto-detection

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

ccw/src/templates/dashboard-js/i18n.js

@@ -278,6 +278,15 @@ const i18n = {
     'codexlens.modelDeleteFailed': 'Model deletion failed',
     'codexlens.deleteModelConfirm': 'Are you sure you want to delete model',
 
+    // CodexLens Indexing Progress
+    'codexlens.indexing': 'Indexing',
+    'codexlens.indexingDesc': 'Building code index for workspace',
+    'codexlens.preparingIndex': 'Preparing index...',
+    'codexlens.filesProcessed': 'Files processed',
+    'codexlens.indexComplete': 'Index complete',
+    'codexlens.indexSuccess': 'Index created successfully',
+    'codexlens.indexFailed': 'Indexing failed',
+
     // Semantic Search Configuration
     'semantic.settings': 'Semantic Search Settings',
     'semantic.testSearch': 'Test Semantic Search',
@@ -1394,6 +1403,15 @@ const i18n = {
     'codexlens.modelDeleteFailed': '模型删除失败',
     'codexlens.deleteModelConfirm': '确定要删除模型',
 
+    // CodexLens 索引进度
+    'codexlens.indexing': '索引中',
+    'codexlens.indexingDesc': '正在为工作区构建代码索引',
+    'codexlens.preparingIndex': '准备索引...',
+    'codexlens.filesProcessed': '已处理文件',
+    'codexlens.indexComplete': '索引完成',
+    'codexlens.indexSuccess': '索引创建成功',
+    'codexlens.indexFailed': '索引失败',
+
     // Semantic Search 配置
     'semantic.settings': '语义搜索设置',
     'semantic.testSearch': '测试语义搜索',